IMO/from what little I know,
A Molybdenum based assy. lube is all that should be used. From what I understand, it has a higher tolerance to avoid galling.
Basically it's thick grease that fills the gaps in bearings to prevent dry-start with a brand new build. Once oil is flowing the assy. lubes job is done. So going by that you want thick, something that won't run away from assy. point to the first turn of the key.

I'm sure there's debate over what's best. But for a single use user I see no reason to spend oodles of money on name brand stuff. Just look for the ingredients at a price you can live with.

The more important factor is using conventional motor oil for break in IMO.

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So would you not use Royal Purple Break in oil? Would seam like with Royal Purples high film strength so called "Synerlec" using them for assembly and break in would be the most ideal. Along with their oil filter which can filter out 25mc particles...

Get good old Motorcraft 5-20 synthetic blend? wort the $$ to get a nice filter for the first 500 miles?

And how do you have oil PSI before starting? is their some way to retrofit an electric oil pump to eliminate the dry start? or just hand turn the engine over a few times and get oil in all the valleys?

Wouldnt use amsoil either , just use something from the local parts place and dont pay a lot for it

To make sure you have oil psi before starting so the oil galleys are primed and ready to have oil psi the sec it starts , remove spk plugs , put charger on batt , unplug coil and remove fuel pump fuse , now spin engine over till you have oil psi , replace fuses , plugs and plug coil in and start engine , you will or should have instant oil psi , if you start with out priming the engine you could see 15-30 sec or running before you see oil psi , not a good thing

Personally I'd use a ford assembly lube, or any standard name brand. I also would not spend oodles of money on ultra high performance race power NOS impregnated assembly lube (lol) but a reputable brand will be fine. Get a cheapo jug of conventional 5w30, you're only running it for a few minutes then draining it all out anyway. I would say any filter other than fram is good for the first few startups, the price difference between fram and motorcraft is negligable, but the difference in quality is almost exponential.

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